Exam 1z0-811 topic 1 question 19 discussion

Delete line 3 and compile the code, you will get 10 10. Hope this explains the reason.

I have run the code and got 10 and 10 as output. Please check yourself if you are in doubt.

Correct answer is B, because the "concat" method doesn't mutate the original string, it returns a new string.

The initial string str is "Hello Java", which has a length of 10 characters. The length() method is used to get the length of the string, and it's printed to the console, resulting in 10. The concat method is used to concatenate the string "SE 8" to the end of the original string. The result of the concatenation is "Hello JavaSE 8", which has a length of 14 characters. The length() method is again used to get the length of the string after concatenation, and it's printed to the console, resulting in 14.